12.20g Eucrite Slice Monomict Basaltic Breccia
|Northwest Africa 12929|
Name: Northwest Africa 12929
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12929
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 23.7 kg
This is 1 of 272 approved meteorites classified as Eucrite-mmict.
|Comments:||Approved 21 Nov 2019|
Writeup from MB 108:
Northwest Africa 12929 (NWA 12929)
Classification: HED achondrite (Eucrite, monomict)
History: Purchased Dec. 2018 by Dustin Dickens in Morocco from anonymous dealer.
Physical characteristics: Many identically appearing pieces, desert weathered exterior, broken surface reveals a dark, fine grained interior.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows mild brecciation with approximately 60% pyroxene and 35% plagioclase. Many pyroxenes have exsolution lamellae. Minor silica and troilite observed. Shock melt veins are present.
Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs61.6±1.8Wo3.3±2.4, Fe/Mn=32±0, n=9; high-Ca pyroxene Fs36.7±9.5Wo33.4±10.9, Fe/Mn=31±0, n=4; plagioclase An89.4±3.1, n=7.
Classification: Monomict basaltic eucrite, equilibrated.
|UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; (institutional address; updated 12 Feb 2015)|
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